Process for preparing highly pure raffinate II (isobutene-free C4-hydrocarbon mixture) and methyl tert- butyl ether

摘要

A process for preparing methyl tert-butyl ether (MTBE) and a substantially isobutene-free C4-hydrocarbon mixture by reaction of an isobutene-containing C4-hydrocarbon stream with methanol over an acid catalyst, wherein, in a first stage in one or more reactor(s), isobutene is reacted with methanol to equilibrium formation of MTBE and, in second stage in a reactive distillation column, the remaining isobutene present in the mixture is reacted over an acid ion exchange resin, where the reactive distillation column is operate in s pressure range from 3 to 15 bar abs. and in a temperature range in the reaction zone from 55oC to 75oC at a reflux ratio of less than 1.